code: def test_negative_sample(self):
      negative_df = get_negative_samples(self.data_in)
  
file_path: analytics-zoo/pyzoo/test/zoo/models/recommendation/test_wideanddeep.py
imports: import pytest
  from pyspark.sql.functions import col, udf
  from zoo.models.recommendation import *
  from zoo.models.recommendation.utils import *
  from zoo.common.nncontext import *
  from test.zoo.pipeline.utils.test_utils import ZooTestCase
label_desc: Use image node_id 8 for calling the TestWideAndDeep obj's underlying member method code with example usage: obj.test_negative_sample() without return types